import { app, BrowserWindow } from 'electron';
import path from 'node:path';
import { fileURLToPath } from 'node:url';
import { spawn } from 'node:child_process';

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

const BUNDLE_ROOT = app.isPackaged
  ? path.join(process.resourcesPath, 'bundle')
  : path.resolve(__dirname, '..');

const NODECG_PORT = Number.parseInt(process.env.NODECG_PORT ?? '9090', 10);
const NODECG_HOST = process.env.NODECG_HOST ?? '127.0.0.1';
const NODECG_URL = `http://${NODECG_HOST}:${NODECG_PORT}`;

let nodecgProcess;

function getNodecgCliPath() {
  return app.isPackaged
    ? path.join(process.resourcesPath, 'app.asar.unpacked', 'node_modules', 'nodecg', 'bin', 'nodecg.js')
    : path.join(__dirname, 'node_modules', 'nodecg', 'bin', 'nodecg.js');
}

function startNodecg() {
  const nodecgCli = getNodecgCliPath();

  nodecgProcess = spawn(process.execPath, [nodecgCli, 'start'], {
    cwd: BUNDLE_ROOT,
    env: {
      ...process.env,
      ELECTRON_RUN_AS_NODE: '1',
      NODECG_PORT: String(NODECG_PORT),
    },
    stdio: 'inherit',
  });

  nodecgProcess.on('exit', (code) => {
    if (code !== 0) {
      console.error(`[electron] NodeCG process exited with code ${code}`);
    }

    if (!app.isQuitting) {
      app.quit();
    }
  });
}

function stopNodecg() {
  if (!nodecgProcess || nodecgProcess.killed) {
    return;
  }

  app.isQuitting = true;
  nodecgProcess.kill();
}

async function waitForNodecg(retries = 80, delayMs = 250) {
  for (let attempt = 0; attempt < retries; attempt += 1) {
    try {
      const response = await fetch(NODECG_URL, { method: 'HEAD' });
      if (response.ok || response.status >= 300) {
        return;
      }
    } catch {
      // Ignore connection errors while NodeCG boots.
    }

    await new Promise((resolve) => {
      setTimeout(resolve, delayMs);
    });
  }

  throw new Error(`NodeCG did not start in time at ${NODECG_URL}`);
}

async function createWindow() {
  const mainWindow = new BrowserWindow({
    width: 1366,
    height: 768,
    autoHideMenuBar: true,
    webPreferences: {
      contextIsolation: true,
      sandbox: true,
    },
  });

  await mainWindow.loadURL(NODECG_URL);
}

app.whenReady().then(async () => {
  startNodecg();

  try {
    await waitForNodecg();
    await createWindow();
  } catch (error) {
    console.error('[electron] Failed to start wrapper:', error);
    app.quit();
  }

  app.on('activate', async () => {
    if (BrowserWindow.getAllWindows().length === 0) {
      await createWindow();
    }
  });
});

app.on('before-quit', () => {
  app.isQuitting = true;
  stopNodecg();
});

app.on('window-all-closed', () => {
  if (process.platform !== 'darwin') {
    app.quit();
  }
});